8.4.5 IV Sense

The TAS2564 provides speaker voltage and current sense for real time monitoring of loudspeaker behavior. The VSNS_P and VSNS_N pins should be connected after any ferrite bead filter (or directly to the OUT_P and OUT_N connections if no EMI filter is used). The V-Sense connections eliminate IR drop error due to packaging, PCB interconnect or ferrite bead filter resistance. It should be noted that any interconnect resistance after the V-Sense terminals will not be corrected for, so it is advised to connect the sense connections as close to the load as possible.

Figure 45. V-Sense Connections

TAS2564 also supports Dual V-Sense Channel. Second V-Sense Channel can be used with dual voice coil speakers. Similar to Conventional Speakers, two of the connections driven by speaker, should be connected after any ferrite bead and as close to load as possible. Center tap can be tapped directly from center terminal of speaker available for dual voice coils.

Figure 46. Dual V-Sense Connections

I-Sense and V-Sense can be powered down by asserting the ISNS_PD, VSNS_PDand VSNS2_PD register bits. When powered down, the device will return null samples for the powered down block. The IV-sense is High Passed Filtered and the Bi-Quad filter coefficients can be changed from the default 2 Hz using the IVHPF_N0, IVHPF_N1, IVHPF_D1 registers using the equations [N, D] = butter(1, fc/(fs/2), 'high'); round(N(0)*2^31);. These coefficients can be calculated and set using PurePath™ Console 3 Software.